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Investigation of polymetallic mineralisation in Lower Devonian volcanics near Alva, central Scotland

By I.H.S. Hall, M.J. Gallagher, B.R.H. Skilton and C.E. Johnson


The subsurface characteristics of three known\ud occurrences of fracture-controlled mineralisation\ud in the Lower Devonian Ochil Volcanic Formation\ud near Alva, central Scotland, were tested by shallow\ud boreholes. Target structures were intersected by\ud each borehole, but they contain only minor\ud amounts of baryte and geochemical enrichments of\ud copper, arsenic and uranium. Differential fracturing\ud within the variegated volcanic sequence and\ud enhanced brecciation at fault intersections are\ud principal controls. Earlier silver-cobalt mineralisation\ud appears to have been followed by copperbarium\ud mineralisation. The andesitic rocks of the\ud volcanic pile represent a suitable source for the\ud metals

Topics: Earth Sciences
Publisher: Institute of Geological Sciences
Year: 1982
OAI identifier:

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